IIRC, the Zone VI stabilizer handles the main part of the load, and simply has an "outlet" for a timer/switch. In that case, you can use any timer or a foot switch without worrying about load, since the timer simply switches the stabilizer on/off.
As good as f-stop timers are, I still use a metronome and percentage calculations with great success... I don't even have a timer (I really dislike them), I just set the metronome on 120, step on the footswitch and print away. Of course, you have to count seconds, but you can keep your eyes on your work more easily.
BTW, I use a Zone VI stabilizer for controlling the light source on one of my enlargers and it works well.